Communication device

Abstract

A communication device includes a system ground plane, a ground element, an antenna element, and a metal guide line. The ground element is coupled to the system ground plane. The ground element has a first edge, a second edge, and a connection point.

The first edge and the second edge are opposite to each other. The connection point is positioned at the second edge. The antenna element is disposed adjacent to, or at, the first edge. One end of the metal guide line is coupled to the connection point, and another end of the metal guide line is open.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This Application claims priority of Taiwan Patent Application No. 104122256 filed on Jul. 9, 2015, the entirety of which is incorporated by reference herein.BACKGROUND OF THE INVENTION[0002]Field of the Invention[0003]The disclosure generally relates to a communication device, and more specifically, to a communication device with an isotropic radiation pattern.[0004]Description of the Related Art[0005]With the progress of mobile communication technology, there are more and diverse applications for wireless communication products. Wireless access points play an important role due to the development of smart houses and the Internet of things. In order to meet market trends and consumer demand, the design of a wireless access point needs a lightweight and stylish appearance. In such a situation, embedded antennas are the first choice. Nevertheless, since embedded antennas are often disposed at a corner or at fragmented regions of a wireless ...

AI Technical Summary

Benefits of technology

[0008]The invention proposes a novel radiation mechanism for appropriately guiding currents on the system ground plane, so as to change the total radiation pattern of the communication device. Without adjusting the antenna element, the invention adds a current guide line for affecting the current distribution on the system ground plane, such that the surface currents are uniformly distributed on the system ground plane and some current nulls are eliminated. The current guide line enhances the symmetry of the antenna element arranged in the communication device, and therefore the communication device can achieve an isotropic radiation pattern.

[0009]In some embodiments of the invention, the metal guide line is coupled to the ground element. The length of the metal guide line is at least 0.2 times the length of the ground element. The metal guide line increases the effective resonant length of the ground element, and therefore a resonant mode of the antenna element is excited well. The impedance matching of the antenna element is also improved. According to the practical measurements, the metal guide line does not reduce the operation bandwidth of the antenna element. It should also be noted that when the total length of the metal guide line and the ground element is an integer multiple of 0.25 wavelength of a central operation frequency of the antenna element, the metal guide line can attract more surface currents on the system ground plane. As a result, the distribution of surface currents becomes more uniform, thereby improving the radiation pattern of the antenna element. In other words, the metal guide line is configured to remove the radiation nulls of the antenna element, resulting in an isotropic radiation pattern of the antenna element.

Problems solved by technology

Nevertheless, since embedded antennas are often disposed at a corner or at fragmented regions of a wireless access point due to its appearance or mechanism, the radiation pattern of the corresponding antenna tends to generate irregular concaves (i.e., radiation nulls), thereby affecting the whole communication quality of the devices.

As a result, it has become a critical challenge for antenna designers to design an isotropic antenna in the limited space of a wireless access point.

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